Yesterday econ/real estate guru Robert Schiller penned an article for the Times examining why Greenspan, market experts and individual investors didn’t see warning signs of the disastrous housing bubble:

The failure to recognize the housing bubble is the core reason for the collapsing house of cards we are seeing in financial markets in the United States and around the world. If people do not see any risk, and see only the prospect of outsized investment returns, they will pursue those returns with disregard for the risks. Were all these people stupid? It can’t be. We have to consider the possibility that perfectly rational people can get caught up in a bubble.

Schiller concludes that the lack of foresight about the bubble has to do with “herd behavior” and “information cascade,” whereby rational investors’ individual decisions add up based on incomplete info. The phenomenon helps explain why an entire nation would be under the thrall of the notion that housing=a great investment. A cascade is possible when a whole country buys into the same belief despite individual analysis that refutes prevailing wisdom. The result? Rising prices and a big bad bubble. So what’s next? “It is now possible that a downward cascade will develop — in which rational individuals become excessively pessimistic as they see others bidding down home prices to abnormally low levels,” writes Schiller.
How a Bubble Stayed Under the Radar [NY Times]
Collage by Amy Jaz.